I would like to configure a secondary exchange server and create a DAG between them in the UK office for DR purposes. Is this a task that requires downtime or is this quite straight forward. can i also create the DAG with them being on the same subnet? basically in the even that EX01 needs to re restarted i need EX02 to take over, any general advice regarding this would be helpful. we are running exchange 2010 on server 2008.